tourism vs travelogue

tourism

noun
  • The act of travelling or sightseeing, particularly away from one's home. 

  • The industry in which such travels and sightseeing are organized. 

  • The act of visiting another region or jurisdiction for a particular purpose. 

travelogue

noun
  • A description of someone's travels, given in the form of narrative, public lecture, slide show or motion picture. 

How often have the words tourism and travelogue occurred in a corpus of books? (source: Google Ngram Viewer )